Door locks



H. G. SHAW DOOR LOCKS Jan. 29, 1957 2 Sheets-Sheet 1 Filed March 10,1955 INV'ENTOR ATTORNEYS Jan. 29, 1957 H. G. SHAW 2,779,614

DOOR LOCKS Filed March 10, 1955 2 Sheets-Sheet 2 gMk ATTGRNEYS .nitedStates DOOR LOCKS Application March 10, 1955, Serial No. 493,379

Claims. (Cl. 292-46) This invention relates to door locks and moreparticularly to a lock adapted for mounting upon a communicating doorsuch as a door between a bedroom and bathroom, for example, wherein apair of dead bolts are mounted, one of which is operated from one sideof the door and the other from the other side.

In some instances such, for example, as where a suite of rooms comprisestwo rooms having a bathroom situated between them with communicatingdoors to both of the adjoining rooms, it is desirable to employ a lockupon the doors leading into the bathroom which is provided with two deadbolts, one of which may be actuated from the bedroom-side of the doorand the other from the bathroom-side of the door. Also in certaininstances it is desirable that the locks be so constructed that bothdead bolts may not be protracted at the same time or, in other words, sothat when the dead bolt mechanism on one side of the door is operated,the other mechanism will be prevented from operation. This is effectedin the present instance by mounting in the lock case a movable member,in this instance a pivoted member, such that this member will beactuated when either of the dead bolts is thrown or projected, themember being moved into engagement with a portion of the other dead boltmechanism to block it against movement. As illustrated, thisinterlocking means between the dead bolts is in the form of a leverpivoted at its intermediate portion in the manner of a walking beamhaving arms extending toward the rollbacks which operate the dead boltso that when one rollback is rotated, it will engage the adjacent arm ofthe walking beam and throw the other arm into engagement with the otherrollback in such a manner as to prevent movement of the latter.Therefore, if one bolt has been thrown or protracted, the other will berestrained from being operated and will be retrained in its retractedposition.

One object of the present invention is to provide a new and improvedlock mechanism having a pair of dead bolts and mechanism connecting saidbolts whereby either thereof may not be protracted when the other is inprotracted position.

A still further object of the invention is the provision of a lockmechanism of the character described having a pair of dead bolts, onebeing operated from one side of the door and the other from the otherside of the door through rollbacks mounted in the lock case, and toprovide a member movably mounted in the lock case which will be moved bythe operation of one of the rollbacks to position to prevent theoperation of the other rollback.

Still another object of the invention is to provide a lock mechanismhaving a pair of dead bolts and independent actuating mechanism for eachof said bolts, one of which is operated from one side of the door andthe other from the opposite side of the door, and to provide a membermovably mounted in the lock case which is effective to prevent theoperation of one of said actuating mechanisms when the other has beenoperated to protract the associated bolt.

atent 2,779,614 Patented Jan. 29, 1957 To these and other ends theinvention consists in the novel features and combinations of parts to behereinafter described and claimed.

In the accompanying drawings:

Fig. 1 is a front elevational view of a lock mechanism embodying myimprovements;

Fig. 2 is a sectional view on line 2-2 of Fig. 1;

Fig. 3 is a sectional view on line 33 of Fig. 2;

Fig. 4 is a view similar to Fig. 3 showing one of bolts in protractedposition;

Fig. 5 is a perspective view of the dogging member pivotally mounted inthe lock case to prevent the protraction of one of the dead bolts whenthe other has been protracted.

To illustrate a preferred embodiment. of my invention, I have shown adoor lock mounted upon a door 10, the lock mechanism being adapted tocooperate with a strike plate 11 mounted upon the door jamb .12. Asshown in Figs. 3 and 4, the strike plate is provided with an elongatedopening 13 which, as will be hereinafter described, is adapted toreceive the latch bolt as well as the two dead bolts.

The lock mechanism comprises a casing 14 within which is reciprocablymounted a latch bolt 15 to which is secured the usual stem 16, the boltbeing urged to protracted position by the spring 37 which bears againsta member 18 secured to the case.

At the rear end of the stem 16 is secured the usual yoke 19 which isoperated by a double-armed rollback 20, the rollback being in turnoperated by the knobs 21 and 22 at either side of the door. The latchbolt structure may be of usual form and no further description thereofis required.

As previously stated, two dead bolts 23 and 24 are provided in the lockcase, these dead bolts being adapted to be reciprocated through openings25 and 26 in the face plate 2'7 of the lock case, as shown moreparticularly in Figs. 3 and 4. The mechanism for actuating the deadbolts is identical except that one is designed to be operated from oneside of the doorand the other from the other side of the door. As withthis exception the mechanism is the same, the description of one willsuffice for both.

Pivoted to the rear portion of each of the dead bolts is one end of alink 28, the other end of the link being pivoted at 29 to a rollback 30.This rollback, as shown, is of irregular shape in that it is provided.with a relatively straight front face 31 and an arcuate face 32 for apur pose to be hereinafter explained. Each of these rollbacks is adaptedto be operated by a turn button, one being operated by the turn button33 at one side of the door and the other by the turn button 34 at theother side of the door. Secured to each of the turn buttons is a stem 35of polygonal cross section, this stem being nonrotatably engaged with acollar 36 rotatably mounted in the wall of the casing, and the rollbacksare secured to these collars so that when the turn buttons are rotated,the rollbacks will likewise be rotated. Suitable stops (not shown) maybe provided to limit the rotation of the turn buttons.

Pivotally mounted upon a wall of the lock case at 38 is a walking beamlever 39. Each end of this lever is provided with a projecting arm 49 inposition to engage the adjacent rollback. it may be noted from Fig. 3that when both dead bolts are retracted, as shown in this figure, thelever 39 is idle in that neither of the arms 40 are engaged with theadjacent rollbacks but stand in a position slightly spaced therefromwhich is the normal position of the parts when the door is not locked.The latch bolt 15, of course, cooperates with the strike plate inholding the door closed in the usual manner.

If it is desired to lock the door, the: occupant of the the room turnsthe'button 33 or '34, depending upon which room'h'e is occupying at thetime. When the'button 34 is turned, the lower rollback is rotated, asshown in Fig. 4, this rollback serving through the associated link 23 toprotract the deadbolt 23 tolock the door. During therotationofthe'ro'llback, the straight side 31' thereof engages the arm46 of the lever 39 and rocks this lever in a clockwise,direction'until'the stiai'ght side 31 passes by the a'r'm'llandthelattenridesjupon the arcuate or camrned surface .32. This surfaceis formed upon an arc described'about the axis of the rollback as acenter so that the lever'39 is maintained in the position shown so longas the am 4-0 is in contact with the surface 32. It will be noted thatin this position the other arm 40 of the lever 39 ismoved against thestraight'surface 31 of the rollback of the deadbolt'24 so as to blockany movement of thisrollbacktoprotract the o'olt'24. Thus the latterbolt cannot be protracted by the turn button 33 while the bolt'23 isinprotracted position.

Likewise'if'thebolt 23 is retracted and the upper rollback' rotatedby'the button 33,'as shown in dotted lines in Fig; 3 to protract thelatch bolt 24, the straight side 31 "of this rollback will similarlyact'asa cam and, by engaging the upper arm 44} of the lever 39, willmove this lever against'the straight side'3ll of the lower rollback andprevent actuation of the latter. Thus while each of the bolts may beoperated from one side of the door, neither can be thrown while theother is in protracted position. 'Thus one entering the bathroom, forexample, andloeking the door from that side, cannot be locked in by theactuation of the other deadbolt from the other side.

It will be understood that this particular mechanism is sometimes'usedin'connection with additional locking mechanism which will enable thedoor to be locked from one side even though it-has been previouslylocked from the other side by the dead bolt mechanism shown herein,

this additional mechanism not being part of the present :to'be limitedto all of the details shown, but is capable of modicatifion andvariation'Withinthe' spirit of the invention and within the scope of theclaims.

What I claim is:

1. 'A door lock comprising a casing, a pair of dead bolts reciprocablymounted in the casing, a rollback in the'casing connected to each boltto actuate the same, one of'saidrollbacks being actuated from one sideof the door" and the otherfrom the other side of the door, alevertpivotally mounted between said'rollbacks andhaving a part in thepath of each of the rollbacks whereby when one rollback is' actuatedtoprotract'the associated bolt, one of the parts on said lever is moved'inposition to prevent rotation of the *other'rollback,

2. A door lock comprising a casing, a pair of dead bolts reciprecablymounted in the casing, spaced rollbacks rotatably mounted in the casing,one connected to each of said bolts to actuate the same, a leverpivotally mounted in the casing between said rollbacks and having spacedarms thereon, one arm lying in the path of each of said rollbacks, andeach of-said rollbacks having a portion to engage one, of said arms andmove said lever into position to dog the other rollback, and a part tomaintain said leverin said position during continued movement of therollback.

3. A door lock comprising a casing, a pair of dead bolts reciprocablymounted in the casing, a pair of rollbacks in 'the'casing, one connectedto'each bolt to actuate the same, said rollbacks being in spacedrelation, a lever surface to engage the arm of the lever and retain thelatter in position totwhich it is moved.

4. A door lock comprising a casing, 21 pair of dead bolts reciprocablymounted therein, actuating means in the casing for'each bolt to protractone bolt independently of the other, a member movably'mounted in thecasing in the path of, and adapted to be engaged by, a part of theactuating means of one boltwhen it is protracted and moved by saidactuating means to a position to engage and block the actuating means ofthe other bolt to'prevent protraction of the latter.

5. A door lock comprising a casing, a pair of dead bolts 'reciprocablymounted in the casing, a rollback in the casing connected to each boltto actuate the same, one of said rollbacks being actuated from one sideof the'door and the other from -'the other side of the door, a membermovably mounted in the casing and having a part in the'path of each ofsaid rollbacks whereby one roll back is actuated to protract itsassociated bolt, one of the parts on said member 'is moved to apositionsto prevent rotation of the other rollback in a direction toprot'r'act its associated bolt.

References Citedin the file of this patent UNITED STATES PATENTS 959,293Berry May'24, 1910 2,470,770 Harvey May 24, 194-9 FOREIGN PATENTS 2,231Austria Sept. 25, 1900 57,092 Germany Oct. 7, 1890 699,008 Great BritainOct. 28, 1953

